High-pressure sodium lamp

Details High-pressure sodium lamp High-pressure sodium lamp

1981-06-10

1983-12-27

Demeo, Palmer C.

Electric lamp and discharge devices

With gas or vapor

Having particular electrode structure

313634, 313638, H01J 6130, H01J 6136, H01J 61073, H01J 6122

Patent

active

044233531

ABSTRACT:
A high-pressure sodium lamp in which the ends of an arc tube which is made of transparent single-crystal alumina and which contains sodium are sealed with feed-throughs each having an electrode extended from the inner end thereof.
Each feed-through is directly sealed to the inner wall surface of each end of the arc tube. In addition, each feed-through is formed with an enlarged-diameter portion which is directly sealed to the inner wall surface at each end of the arc tube and a reduced-diameter portion which is spaced apart from the inner wall surface at each end of the arc tube.

REFERENCES:
patent: 3363134 (1968-01-01), Johnson
patent: 3832590 (1974-08-01), Yamazaki et al.
patent: 3911313 (1975-10-01), Makar, Jr.
patent: 3932782 (1976-01-01), Kopelman
patent: 4065691 (1977-12-01), McVey

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